Deleting user now works, and forces you to allocate tasks from each user to another user before deleting them

backend/main.py

@@ -96,6 +96,19 @@ def delete_user(user_id: str, db: Session = Depends(get_db), current_user: model
     db_user = db.query(models.User).filter(models.User.id == user_id).first()
     if not db_user:
         raise HTTPException(status_code=404, detail="User not found")
+
+    # Check for OPEN assigned tasks (that are not in the trash)
+    open_tasks = db.query(models.Task).filter(
+        models.Task.assignee_id == user_id,
+        models.Task.status == "open",
+        models.Task.deleted_at == None
+    ).first()
+    if open_tasks:
+        raise HTTPException(status_code=400, detail="Cannot delete user: They still have OPEN tasks assigned to them. Reassign them first.")
+
+    # Nullify references in closed tasks and notes so we don't lose history
+    db.query(models.Task).filter(models.Task.assignee_id == user_id).update({"assignee_id": None})
+    db.query(models.TaskNote).filter(models.TaskNote.author_id == user_id).update({"author_id": None})
     
     db.delete(db_user)
     db.commit()

backend/models.py

@@ -59,7 +59,7 @@ class TaskNote(Base):
 
     id = Column(Integer, primary_key=True, index=True)
     task_id = Column(String, ForeignKey("tasks.id", ondelete="CASCADE"), nullable=False)
-    author_id = Column(String, ForeignKey("users.id"), nullable=False)
+    author_id = Column(String, ForeignKey("users.id"), nullable=True)
     body = Column(String, nullable=False)
     created_at = Column(DateTime(timezone=True), server_default=func.now())
 

backend/schemas.py

@@ -62,7 +62,7 @@ class Tag(TagBase):
 class TaskBase(BaseModel):
     title: str
     description: Optional[str] = None
-    assignee_id: str
+    assignee_id: Optional[str] = None
     added_by: str
     priority: str
     source: str